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3x+4=2x+12+7x+6
We move all terms to the left:
3x+4-(2x+12+7x+6)=0
We add all the numbers together, and all the variables
3x-(9x+18)+4=0
We get rid of parentheses
3x-9x-18+4=0
We add all the numbers together, and all the variables
-6x-14=0
We move all terms containing x to the left, all other terms to the right
-6x=14
x=14/-6
x=-2+1/3
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